I was about to say a doll. My daughter will be 3 1/2 when he arrives. She doesn't play with baby dolls much, even though she has them. I have heard of getting a baby doll for big sister to "change" when mommy changes baby and so forth, but IDK. My daughter is just not that into baby dolls right now, so I may just get her whatever she is into that the time. Which right now is these little Magic Clip Dolls. Their dresses clip off and on. She plays with them everywhere. Church, home, daycare, the car. She never puts them down.